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What is the effect of added sodium thioc...

What is the effect of added sodium thiocyanate on the following equilibrium?
`Fe^(3+) (aq)+SCN^(-) (aq) leftrightarrow [FeSCN]^2+(aq)`

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When Some NaSCN is added, it gives `SCN^(-)` ions in solution. The concentration of one of the reactants increases favouring the forward reaction of forming complex. The colour of solution darkens on adding NaSCN, showing an increase in the concentration of `[FeSCN]^(2+)` which is reddish brown.
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